a certain

idiom

Definition of a certain

1 used to refer to a quality that is noticed but that is difficult to explain or describeShe has a certain elegance about her.The house has a certain charm.
2 formal used with the name of a person one does not knowIn 1889, a certain Mr. Kelly made a large donation to the church.

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“A certain.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/a%20certain. Accessed 3 Aug. 2020.

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